Investigation of Antifeedant and Other Insecticidal Activities of Trewiasine Towards the Striped Cucumber Beetle and Codling Moth

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Abstract:

Trewiasine, a maytansinoid isolated from seed of Trewia nudiflora (Euphorbiaceae) was found to be highly toxic to both the adult striped cucumber beetle, Acalymma villatum (F.) and the larvae of the codling moth, Cydia pomonella (L.) Trewiasine was shown to have an LD50 of 0.006–0.007% at the 6th day after treatment of striped cucumber beetles. Antifeedant activity was exhibited against this insect when muskmelons in the greenhouse were protected from feeding for 10 days with a 0.1% treatment. One hundred percent mortality of C. pomonella larvae occurred when dosage levels as low as 0.32 ppm were incorporated into the diet. Growth was markedly affected at all doses tested. Exposure to the LD50 for 3 days on treated diet resulted in suppression of normal growth and development. Antifeedant activity against C. pomonella were also observed. However, changes in growth rates and even mortality were observed when low dosages of trewiasine were included in the larval diet. Topical application of trewiasine to 4th-instar larvae of C. pomonella caused both mortality and delayed maturity.

Document Type: Research Article

Publication date: June 1, 1983

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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